| 摘要 |
PURPOSE:To perform brushless detection of a rotating speed with high sensitivity by obtaining a rotating speed signal in accordance with the frequency difference of the two-frequency modulating signals outputted from two phases of output windings of a resolver. CONSTITUTION:An excitation signal is applied from a sine wave signal oscillator 2 to the excitation winding WX of a resolver 1. The 1st phase shifter S1 and the 2nd phase shifter S2 are connected to two phases of output windings Walpha, Wbeta of the resolver 1, and are further connected to waveform shaping circuits 7, 8. The outputs of the circuits 7, 8 are applied to frequency-voltage converters 9, 10, and the differential voltage of the respective converter is outputted from a differential amplifier 1 by which the signal proportional to the rotating speed is obtd. |
